Increase in hippocampal histone H3K9me3 is negatively correlated with memory in old male mice.

This study for the first time reports involvement of H3K9me3 in the regulation of neuronal IEGs during aging. Using novel object recognition and Y-maze test, the recognition and spatial memory was checked in male mice of different ages and it was found to decline in old. We have examined the expression of H3K9me3 specific histone methyltransferases and noted that only SUV39H1 (suppressor of variegation 3-9 homolog 1) increased significantly in old. Also the global H3K9me3 level was high in the hippocampus of old male mice. Further, chromatin immunoprecipitation assay revealed rise in H3K9me3 level at the promoter of IEGs in old as compared to young male mice. The immunofluorescence analysis also showed varying pattern of H3K9me3 expression in different subregions of hippocampus with aging. These findings showed negative correlation of increase in hippocampal histone H3K9me3 with memory decline in old male mice. Diagram here represents that during aging, there is increase in expression of SUV39H1. Such increased enzyme upregulates global and gene specific methylation in hippocampus of old male mice. H3K9me3 level increases at the promoter of neuronal IEGs leading to heterochromatisation and hence decrease in their expression and ultimately decline in memory during aging. PMID: 31760560 [PubMed - as supplied by publisher]
Source: Biogerontology - Category: Geriatrics Authors: Tags: Biogerontology Source Type: research